(a)[2]
Use the thermometer readings to fill the table for ammonium chloride.
(b)[2]
What difficulty could the student face when carrying out the experiment with $2.0\,g$ of potassium nitrate? State how this difficulty could be dealt with.
(c)[3]
Plot the data for both ammonium chloride and potassium nitrate on the grid, draw smooth curves and label them. Extend both curves so that each crosses the $y$-axis.
(d)[2]
Use your graphs to determine the mass of each compound that dissolves in $10\,g$ of water at $0^\circ\text{C}$.
(e(i))[1]
At what temperature do the two compounds have the same solubility?
(e(ii))[1]
Use the graphs to find the solubility of both compounds at this temperature.
(f)[2]
Describe the appearance of the contents of each boiling tube at $45^\circ\text{C}$.